EP3420615B1 - Bougie d'allumage à préchambre - Google Patents

Bougie d'allumage à préchambre Download PDF

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Publication number
EP3420615B1
EP3420615B1 EP17842286.1A EP17842286A EP3420615B1 EP 3420615 B1 EP3420615 B1 EP 3420615B1 EP 17842286 A EP17842286 A EP 17842286A EP 3420615 B1 EP3420615 B1 EP 3420615B1
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EP
European Patent Office
Prior art keywords
spark plug
chamber
equal
range
prechamber
Prior art date
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EP17842286.1A
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German (de)
English (en)
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EP3420615A1 (fr
Inventor
Steffen Kuhnert
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DKT Verwaltungs GmbH
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DKT Verwaltungs GmbH
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/54—Sparking plugs having electrodes arranged in a partly-enclosed ignition chamber

Definitions

  • the present invention relates to an antechamber spark plug with a housing, a ground electrode and an antechamber defined by the housing and a cap, a center electrode being arranged within the antechamber.
  • Pre-chamber spark plugs of the type in question have been known from practice for years.
  • prechamber spark plugs are used in internal combustion engines that operate on the lean-burn principle.
  • Pre-chamber spark plugs have a pre-chamber which interacts with the combustion chamber of an internal combustion engine through transfer openings.
  • the fuel-air mixture is ignited by means of ignition sparks in the prechamber, after which the combustion continues in the form of ignition torches through the transfer openings into the combustion chamber of the internal combustion engine, where the mixture ignites.
  • a prechamber spark plug is, for example, from WO 2007/092972 A1 known.
  • This spark plug has an antechamber provided with an antechamber wall and a cover surface.
  • the antechamber wall comprises a cylindrical part to which rectangular ground electrodes are also attached by means of rectangular ground electrode supports.
  • the ground electrodes are assigned rectangular ignition electrodes which are attached to a central ignition electrode carrier. Several pairs of ignition surfaces are thus created with which ignition is to take place as centrally as possible with respect to the prechamber.
  • the known prechamber spark plugs have the disadvantage that relatively high wall heat losses occur. Another disadvantage is the insufficient flame spread, which leads to a low degree of efficiency of the prechamber spark plug.
  • the present invention is therefore based on the object of designing and developing a prechamber spark plug of the type mentioned at the beginning in such a way that the function of the prechamber spark plug is improved with structurally simple means.
  • the prechamber spark plug in question is characterized in that the ratio V / D of the prechamber volume V to the largest inner diameter D of the prechamber is in the range from 30 mm 2 to 95 mm 2 .
  • the invention is based on the knowledge that the layout of the prechamber has significant effects on the functionality of the prechamber spark plug.
  • a sufficiently spherical design of the antechamber results in optimal flame propagation and reduced wall heat losses.
  • the ratio V / D between the prechamber volume V enclosed by the prechamber and the largest inner diameter D of the prechamber is optimized, namely in the range from 40 mm 2 to 70 mm 2 . With such a ratio of V / D, the functionality of the prechamber spark plug is optimized in an ideal way.
  • prechamber volume is to be understood as the volume of the prechamber enclosed by the inner wall of the housing and the cap or the electrodes without the overflow bores or transfer passages.
  • At least one corner and / or edge formed on the inside of the antechamber can be rounded.
  • all of the corners and / or edges formed on the inside of the antechamber are rounded.
  • the rounded design avoids hot spots in the antechamber. This has the advantage that uncontrolled ignition of the fuel-air mixture on such a hot surface is largely prevented.
  • the rounded corner or the rounded corners have a radius R E of greater than or equal to 0.4 mm, ie R 0.4 mm and / or an angle ⁇ in the range of greater than or equal to 90 Define °.
  • At least one of the edges formed on the inside of the antechamber can have an angle ⁇ ′ in the range from greater than or equal to 90 ° to less than 100 ° and / or have a radius R K of greater than or equal to 0.8 mm, ie 90 ° ⁇ ⁇ ' ⁇ 100 ° and R K ⁇ 0.8 mm.
  • the angle ⁇ ' is in the range from greater than or equal to 100 ° to less than 120 ° and / or the radius R K is in a range greater than or equal to 0.6 mm, ie 100 ° ⁇ ⁇ ' ⁇ 120 ° and R K ⁇ 0.6 mm.
  • the radius R K can be in a range of greater than or equal to 0.4 mm and / or the angle ⁇ 'can be configured to be greater than or equal to 120 °, ie ⁇ ' ⁇ 120 ° and R 0.4 mm.
  • the ratio y / D a between the protrusion dimension y and the largest outer diameter D a of the cap can be in the range from 0.2 to 1.0.
  • the protrusion dimension y is defined as the length of the area of the prechamber spark plug which protrudes beyond the combustion chamber roof into the combustion chamber.
  • the weld seam can be at the same level as or above the combustion chamber roof when the prechamber spark plug is arranged in the combustion chamber roof. This ensures that the weld seam is not subject to excessive erosion due to contact with the gases and flames in the combustion chamber.
  • the invention in question here also comprises a set consisting of a combustion chamber roof and an antechamber spark plug with a housing, a ground electrode and an antechamber defined by the housing and a cap, a center electrode being arranged within the antechamber and wherein in the state of the prechamber spark plug arranged in the combustion chamber roof, the ratio y / D a between protrusion dimension y and maximum
  • the outer diameter D a of the cap is in the range from 0.2 to 1.0 and / or the weld seam connecting the cap to the housing is at the same level or above the combustion chamber roof.
  • the prechamber spark plug of the set can have one or more features of claims 1 to 10 and the description of the figures below.
  • the invention in question also relates to an antechamber spark plug with a housing, a ground electrode and an antechamber defined by the housing and a cap, a center electrode being arranged within the antechamber and the ratio y / D a in the state of the antechamber spark plug in the combustion chamber roof between the protrusion dimension y and the largest outer diameter D a of the cap is in the range from 0.2 to 1.0 and / or the weld seam connecting the cap to the housing is at the same level or above the combustion chamber roof.
  • a spark plug can have one or more of the features of claims 1 to 10 and the description of the figures below.
  • the present invention also relates to an antechamber spark plug with a housing, a ground electrode and an antechamber defined by the housing and a cap, a center electrode being arranged within the antechamber, with at least one corner and / or edge formed on the inside of the antechamber being rounded.
  • a prechamber spark plug can also have one or more features of claims 1 to 9 and the following description of the figures.
  • the Figs. 1 to 3 show in a schematic representation an embodiment of a prechamber spark plug according to the invention.
  • the prechamber spark plug has a housing 3 formed from a first housing part 1 and a second housing part 2.
  • the housing parts 1, 2 are connected to one another via a weld seam.
  • the housing 1 surrounds part of an insulator 4.
  • a supply line (not shown) is arranged inside the insulator 4 and supplies the central electrode 6 provided within the antechamber 5 with electrical voltage.
  • the center electrode 6 comprises a total of four electrode arms 7.
  • the center electrode 6 can, however, also have a different geometry. It should also be pointed out that the housing 3 can also be designed in one piece.
  • the first housing part 1 serves as a ground electrode and has an external thread 8 in order to fix the prechamber spark plug in a housing cover which defines the combustion chamber roof 9, as shown in FIG Fig. 3 is shown.
  • the prechamber 5 is closed by the cap 10 in the direction of the main combustion chamber.
  • the cap 10 is connected to the first housing part 1 via a weld 11. It is conceivable that the cap 10 extends as far as the center electrode 6 and serves as a ground electrode.
  • the cap 10 has a plurality of passage passages 12 which can be arranged around the cap 10 in the circumferential direction.
  • the largest inner diameter D of the prechamber 5 is shown. It is essential that the ratio of the prechamber volume V to the largest inner diameter D of the prechamber is in the range from 30 mm 2 to 95 mm 2 , in particular in the range from 35 mm 2 to 90 mm 2 , preferably in the range from 40 mm 2 to 70 mm 2 .
  • Fig. 2 and 3 the largest outer diameter D a of the cap 10 is shown. Furthermore goes out Fig. 3 the protrusion y of the prechamber spark plug arranged in the combustion chamber roof 9 emerges.
  • the ratio y / D a between the protrusion dimension y and the largest outside diameter D a of the cap 5 is advantageously in the range from 0.2 to 1.0.
  • Fig. 3 it is also shown that the weld seam 11, which connects the cap 10 to the first housing part 1, is at the same height as the combustion chamber roof 9.
  • the weld seam 11 is arranged above the combustion chamber roof 9, so that only part of the cap 10 protrudes into the combustion chamber.
  • the corners 13 and edges 14 realized on the inside of the antechamber 5 are rounded.
  • the corners 13 can have a radius R E of greater than or equal to 0.4 mm and / or an angle ⁇ of greater than or equal to 90 °.
  • the angle ⁇ measures approximately 120 °.
  • An angle greater than 90 ° has the advantage that the radius can be made smaller, so that less reworking is necessary.
  • the angle ⁇ 'formed by the edges 14 can be in the range from greater than or equal to 90 ° to less than 100 ° and / or the edges 14 can have a radius R K of greater than or equal to 0.8 mm.
  • the angle ⁇ ′ is in the range from greater than or equal to 100 ° to less than 120 ° and / or that the edges 14 have a radius R K of greater than or equal to 0.6 mm.
  • the edges can have a radius R K of greater than or equal to 0.4 mm and / or the angle ⁇ ′ can be in the range of greater than or equal to 120 °.
  • the angles ⁇ and ⁇ ' can be designed as alternating angles.

Landscapes

  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Claims (9)

  1. Bougie d'allumage de pré-chambre avec un boîtier (3), une électrode de masse et une pré-chambre (5) définie par le boîtier (3) et un capuchon (10), dans laquelle, à l'intérieur de la pré-chambre (5), est disposée une électrode centrale (6),
    caractérisée en ce que le rapport V/D entre le volume de la pré-chambre et le diamètre intérieur le plus grand D de la pré-chambre (5) est de l'ordre de 40 mm2 à 70 mm2.
  2. Bougie d'allumage de pré-chambre selon la revendication 1, caractérisée en ce qu'au moins un angle (13) et/ou une arête (14), formée sur le côté intérieur de la pré-chambre (5), est arrondie.
  3. Bougie d'allumage de pré-chambre selon la revendication 1 ou 2, caractérisée en ce que tous les angles (13) et/ou arêtes (14) formées sur le côté intérieur de la pré-chambre (5) sont arrondies.
  4. Bougie d'allumage de pré-chambre selon la revendication 2 ou 3, caractérisée en ce que l'angle (13) resp. les angles (13) présentent un rayon RE supérieur ou égal à 0,4 mm et/ou un angle β supérieur ou égal à 90°.
  5. Bougie d'allumage de pré-chambre selon l'une des revendications 1 à 4, caractérisée en ce qu'au moins une des arêtes (14) formées sur le côté intérieur de la pré-chambre (5) présente un angle β' de supérieur ou égal à 90° à inférieur à 100° et/ou un rayon RK supérieur ou égal à 0,8 mm.
  6. Bougie d'allumage de pré-chambre selon l'une des revendications 1 à 5, caractérisée en ce qu'au moins une des arêtes (14) formées sur le côté intérieur de la pré-chambre (5) présente un angle β' de supérieur ou égal à 100° à inférieur à 120° et/ou un rayon RK supérieur ou égal à 0,6 mm.
  7. Bougie d'allumage de pré-chambre selon l'une des revendications 1 à 5, caractérisée en ce qu'au moins une des arêtes (14) formées sur le côté intérieur de la pré-chambre (5) présente un angle β' supérieur ou égal à 120° et/ou un rayon RK supérieur ou égal à 0,4 mm.
  8. Bougie d'allumage de pré-chambre selon l'une des revendications 1 à 7, caractérisée en ce que, dans un état disposé dans le toit de la chambre de combustion (9), le rapport y/Da entre la dimension de dépassement y et le diamètre extérieur le plus grand Da du capuchon (10) est de l'ordre de 0,2 à 1,0.
  9. Bougie d'allumage de pré-chambre selon l'une des revendications 1 à 8, caractérisée en ce que, dans un état disposé dans le toit de la chambre de combustion (9), le cordon de soudure (11) reliant le capuchon (14) avec le boîtier (3) se trouve à la même hauteur ou au-dessus du toit de la chambre de combustion (9).
EP17842286.1A 2017-03-14 2017-12-18 Bougie d'allumage à préchambre Active EP3420615B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017204241.9A DE102017204241A1 (de) 2017-03-14 2017-03-14 Vorkammerzündkerze
PCT/DE2017/200135 WO2018166549A1 (fr) 2017-03-14 2017-12-18 Bougie d'allumage à préchambre

Publications (2)

Publication Number Publication Date
EP3420615A1 EP3420615A1 (fr) 2019-01-02
EP3420615B1 true EP3420615B1 (fr) 2021-01-13

Family

ID=61223667

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17842286.1A Active EP3420615B1 (fr) 2017-03-14 2017-12-18 Bougie d'allumage à préchambre

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US (1) US11233380B2 (fr)
EP (1) EP3420615B1 (fr)
DE (1) DE102017204241A1 (fr)
WO (1) WO2018166549A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019205478A1 (de) 2019-04-16 2020-10-22 Robert Bosch Gmbh Vorkammerzündkerze mit angepasster Kappengeometrie
DE102021204751A1 (de) * 2021-05-11 2022-11-17 Robert Bosch Gesellschaft mit beschränkter Haftung Vorkammerzündkerze mit verbessertem Wärmemanagement

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2715943A1 (de) 1977-04-09 1978-10-12 Bosch Gmbh Robert Brennkraftmaschine mit einem hauptbrennraum und einer zuendkammer
EP0675272B1 (fr) 1994-03-29 1997-08-06 Dieter Dr. Kuhnert Dispositif d'allumage à préchambre
WO2004036013A1 (fr) 2002-10-18 2004-04-29 Peugeot Citroen Automobiles S.A. Dispositif d'allumage a prechambre pour un moteur a combustion interne, allumeur a prechambre et procede d'allumage
WO2012091739A2 (fr) 2010-12-31 2012-07-05 Prometheus Applied Technologies, Llc Système d'allumage à préchambre
EP1984993B1 (fr) 2006-02-17 2013-08-28 GE Jenbacher GmbH & Co. OHG Bougie d' allumage

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
DE3145119A1 (de) * 1981-11-13 1983-05-19 Daimler-Benz Ag, 7000 Stuttgart "zuendkerze fuer eine brennkraftmaschine"
US20050000484A1 (en) 2003-07-03 2005-01-06 Schultz James M. Pre-chambered type spark plug with a flat bottom being aligned with a bottom surface of a cylinder head
JP2005090381A (ja) 2003-09-18 2005-04-07 Niigata Power Systems Co Ltd パイロット油着火ガスエンジン
US8584648B2 (en) * 2010-11-23 2013-11-19 Woodward, Inc. Controlled spark ignited flame kernel flow
US9739192B2 (en) * 2015-05-04 2017-08-22 Caterpillar Inc. Fuel combustion system, nozzle for prechamber assembly with curved orifices, and method of making same
DE102015220539B4 (de) * 2015-10-21 2017-06-01 Mtu Friedrichshafen Gmbh Vorkammer für eine Brennkraftmaschine, Brennkraftmaschine mit einer solchen Vorkammer und Verfahren zum Auslegen und/oder Herstellen einer solchen Vorkammer
EP3173596B1 (fr) * 2015-11-25 2020-04-01 Caterpillar Energy Solutions GmbH Ensemble chambre de précombustion pour moteurs à combustion interne

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2715943A1 (de) 1977-04-09 1978-10-12 Bosch Gmbh Robert Brennkraftmaschine mit einem hauptbrennraum und einer zuendkammer
EP0675272B1 (fr) 1994-03-29 1997-08-06 Dieter Dr. Kuhnert Dispositif d'allumage à préchambre
WO2004036013A1 (fr) 2002-10-18 2004-04-29 Peugeot Citroen Automobiles S.A. Dispositif d'allumage a prechambre pour un moteur a combustion interne, allumeur a prechambre et procede d'allumage
EP1984993B1 (fr) 2006-02-17 2013-08-28 GE Jenbacher GmbH & Co. OHG Bougie d' allumage
WO2012091739A2 (fr) 2010-12-31 2012-07-05 Prometheus Applied Technologies, Llc Système d'allumage à préchambre

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BRONSTEIN, SEMENDJAJEW, MUSIOL, MÜHLIG: "Taschenbuch der Mathematik", 1999, VERLAG, article "Tabelle 3.5", pages: 150 - 151, XP055856565

Also Published As

Publication number Publication date
WO2018166549A1 (fr) 2018-09-20
DE102017204241A1 (de) 2018-09-20
US11233380B2 (en) 2022-01-25
EP3420615A1 (fr) 2019-01-02
US20210135433A1 (en) 2021-05-06

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